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200th Anniversary Meeting of the Russian Mineralogical Society
Saint Petersburg, Russia
10-13 October 2017
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The formation mechanism of feldspar ovoids in rapakivi granites, chrome-spinellide nodules and orbicular olivine in peridotites. The role of mineral forming environment mobility for the implementation of normal mechanism of crystals growing

RMS-DPI code:  2017-1-69-0
Scientific session:  2. Mineralogical crystallography and crystal chemistry.
Author listing:  Spiridonov E.M.
Principal author:  Spiridonov Ernst Maxovich.
Language:  Russian
Abstract - Summary 
(short description):
As it was observed during the process of ice crystallization in Baikal Lake, rounded shape of ice crystals originates under very strong wind, which forces them to rotate intensively, providing ideal conditions for normal mechanism of crystals growing. The patterns of rapakivi granites textures correlate with these observations – K-Na feldspar ovoids are flowed around by feldspar tabular crystals of the next generation. This, as well as concentric arrangement of biotite and hastingsite inclusions inside the ovoids, conformal to their external form, shows the growing of the ovoids in the melt during the process of rotation. Thus, ovoids in rapakivi granites grew up as oolites way. Probably, significant mobility of the mineral forming environment is the necessary condition for implementation of normal mechanism of crystal growing.
Keywords: normal mechanism of crystal growing, mobility of the mineral forming environment, feldspar ovoids, chrome-spinellides nodules, orbicular olivine.
 
Date of presentation:  11/10/2017
Presentation Place:  Горный университет, Малый Актовый зал
 
RMS-DPI code:  2017-1-69-0
Pages:  126-128
File of proceedings 
(PDF): 
 342 K
Status:  printed
Accepted:  15/09/2017
Published on-line:  06/12/2017
Permanent address of publication:  http://www.minsoc.ru/2017-1-69-0/
Contact author(s):  Spiridonov, Ernst Maxovich.
 

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